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umka21 [38]
3 years ago
11

A teacher rubbed a match against a piece of sandpaper. The match started to burn. Which statement best describes the energy chan

ges that occurred?
a. The light energy and thermal energy stored in the match changed to mechanical energy.
b. The thermal energy stored in the match changed to light energy and chemical energy.
c.The chemical energy stored in the match changed to thermal energy and light energy. d.The light energy and thermal energy stored in the match changed to chemical energy.
Chemistry
2 answers:
Pavel [41]3 years ago
7 0

Answer:

C

Explanation:

According to the law of conservation of energy, " energy cannot be created nor destroyed, but only transformed".

That means the energy is produced when the match lights up it must come from somewhere.

timurjin [86]3 years ago
4 0

Answer:

C

Explanation:

The chemical energy stored in the match changed to thermal energy and light energy.

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Two different compounds are formed by the elements nitrogen and oxygen. The first compound, compound P1, contains 64.17% by mass
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Answer:

Explanation:

To solve the problem, we must know the kind of compounds we are dealing with.

For the first compound, P1 and second compound P2:

                                N                       O                         N                     O

Mass percent       64.17                 35.73                  47.23               52.79

Atomic mass          14                      16                         14                    16

Number of

moles            64.17/14            35.73/16            47.23/14    52.79/16      

                            4.58                  2.23                     3.37                  3.30

Simplest

ratio                 4.58/2.23            2.23/2.23             3.37/3.30         3.3/3.3

                              2                           1                             1                        1

                             

P1 compound is N₂O

P2 compound is NO

These are the compounds,

   In N₂O = 28:16

          NO = 14:16

This is the ratio of nitrogen to a fixed mass of oxygen for the two compounds.

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